JP6253547B2 - Liquid feeding device and chemical analyzer using the liquid feeding device - Google Patents

Description

The present invention relates to a liquid feeding device for flowing a liquid and a chemical analysis apparatus using the liquid feeding device.

  The liquid feeding device is an apparatus that supplies a necessary solution using a pump or the like to a chemical analyzer that performs reaction and analysis of a sample. For example, Patent Document 1 relates to a liquid feeding device for a liquid chromatograph, in which a first is provided in a predetermined direction for a gradient liquid feeding that sequentially changes the composition of an eluent and supplies it to an analysis column. Connected to the first flow path, the second flow path, and the third flow path, and to the n fourth flow paths that are narrower than the first flow path, and to the second flow path. A gradient apparatus having n fifth flow paths thinner than the second flow path and the mixing tank is described.

JP-A-2005-274148

  In the case where liquid is passed through only one arbitrary flow path from a plurality of flow paths connected in parallel, for example, in a configuration in which a plurality of liquid feed devices are connected in parallel, liquid is passed through only one arbitrary liquid feed device. In this case, it is necessary to make the flow resistance of the parallel flow paths non-uniform by some means. Normally, a valve is inserted into each of the parallel flow paths, and the remaining flow paths are allowed to flow by physically blocking the flow paths that do not allow liquid flow. However, in this method, since the valve body portion of the valve comes into contact with the liquid, cleaning is necessary for repeated use, and the running cost is high.

  According to the technique described in Patent Document 1, the flow of the liquid is controlled using a passive valve utilizing the flow resistance of a narrow flow path without using a normal valve that drives the valve body. However, in this method, all the mixing tanks in the flow paths connected in parallel can be passed simultaneously, but only one arbitrary flow path cannot be passed. Not considered.

An object of the present invention is to provide a liquid feeding device capable of selectively passing only one arbitrary flow path from flow paths connected in parallel without using a normal valve that drives a valve body. That is.

As one aspect for solving the above-mentioned problems, a first liquid feeding unit for feeding a first liquid containing an analysis target and a second liquid feeding unit for feeding a second liquid not containing the analysis target A measuring unit that measures the physical properties of the fed first liquid, a liquid pool unit that accommodates the fed first and second liquids, and a plurality of passive valves. A chemical analysis apparatus comprising: a liquid feeding device; and a drainage unit that discharges the first liquid and the second liquid that are fed.
The liquid pool section includes a first liquid pool section and a second liquid pool section, a first flow path connecting the first liquid feeding section and the liquid feeding device, and the measurement section. And a second flow path connecting the second liquid pool section, a third flow path connecting the second liquid feeding section, and the drainage section, and the first liquid pool section. A second air port provided in the second liquid pool portion, and the passive valve includes one end portion of the first liquid pool portion and the third air port. And a second passive valve disposed between the other end portion of the first liquid pool portion and one end portion of the second liquid pool portion. And a valve.

  ADVANTAGE OF THE INVENTION According to this invention, the liquid feeding device which can selectively permeate | transmit only one arbitrary flow path from the flow path connected in parallel, without using the normal valve which drives a valve body is provided. be able to. As a result, the structure of the wetted part can be simplified and the dead volume can be reduced.

Problems, configurations, and effects other than those described above will be clarified by the following description of embodiments.

The figure which shows the example of the basic composition of the chemical analyzer which concerns on this Embodiment. The figure which shows the side surface of the liquid feeding device which concerns on this Embodiment. The figure which shows the upper surface of the liquid feeding device which concerns on this Embodiment. The figure which shows the lower surface of the liquid feeding device which concerns on this Embodiment. The figure explaining the example of the flow operation | movement of the liquid in the chemical analyzer which concerns on this Embodiment. The figure explaining the example of the flow operation | movement of the liquid in the chemical analyzer which concerns on this Embodiment. The figure explaining the example of the flow operation | movement of the liquid in the chemical analyzer which concerns on this Embodiment. The figure explaining the example of the flow operation | movement of the liquid in the chemical analyzer which concerns on this Embodiment. The figure explaining the example of the flow operation | movement of the liquid in the chemical analyzer which concerns on this Embodiment. The figure explaining the example of the flow operation | movement of the liquid in the chemical analyzer which concerns on this Embodiment. The figure explaining the example of the flow operation | movement of the liquid in the chemical analyzer which concerns on this Embodiment. The figure explaining the example of the flow operation | movement of the liquid in the chemical analyzer which concerns on this Embodiment. The figure explaining the example of the flow operation | movement of the liquid in the chemical analyzer which concerns on this Embodiment. The figure explaining the example of the flow operation | movement of the liquid in the chemical analyzer which concerns on this Embodiment. The figure explaining the example of the flow operation | movement of the liquid in the chemical analyzer which concerns on this Embodiment. The figure explaining the example of the flow operation | movement of the liquid in the chemical analyzer which concerns on this Embodiment.

Hereinafter, the present embodiment will be described with reference to the drawings.

(Whole device)
FIG. 1 is a diagram illustrating an example of a basic configuration of a chemical analysis apparatus in which four liquid feeding devices according to the present embodiment are connected. In the chemical analysis apparatus 1 shown in the figure, the liquid feeding devices 21 to 24, the supply connector 5 that supplies the sample liquid 131 and the system water 141 to the liquid feeding device 21, and the liquid waste from the liquid feeding device 24 are discharged. A discharge connector 6 for discharging to the fluid 7 is fluidly connected via packing members 401, 402, 411, 412, 421, 422, 431, 432, 441, 442. Here, the sample liquid 131 is a solution containing the sample to be analyzed, and the system water 141 is a liquid used for controlling the flow of the sample liquid 131 of each of the liquid feeding devices 21 to 24 as described later. Say.

  The supply connector 5 is fixed to a device pressing and fixing jig 181. The discharge connector 6 is fixed to the device pressing jig movable 182. The device holding fixture jig 181 is fixed to the guide rail 183. On the other hand, the device pressing movable jig 182 can move in the horizontal direction in the figure with respect to the guide rail 183. When the device pressing movable jig 182 is moved in the left direction in the figure, the liquid feeding devices 21 to 24, the discharge connector 6, and the packing members 401 to 442 are pressed against the supply connector 5.

  The packing members 401 to 442 are made of a material that is more easily deformed than the supply connector 5, the liquid feeding devices 21 to 24, and the discharge connector 6, and the packing members 401 to 442 are deformed by pressing and the supply connector 5, the liquid feeding By closely contacting the devices 21 to 24 and the discharge connector 6, the pressure resistance of the fluid connection portion is secured.

  The liquid feeding devices 21 to 24 are equipped with air connectors 311, 321, 331, and 341 for supplying air or discharging air. The air connectors 311, 321, 331, and 341 are formed so as to be movable in the left-right direction in the figure with respect to the guide rail 183, similarly to the device pressing movable jig 182. Thereby, the liquid feeding devices 21 to 24 can be pressed against the device pressing and fixing jig 181 by the device pressing movable jig 182.

  Air inlets / outlets 21a, 21b, 22a, 22b, 23a, 23b, 24a, and 24b, which will be described later, are provided on the lower surfaces of the liquid feeding devices 21 to 24, respectively. Air connection portions 312 and 313 are pressed against and closely contacted with the air inlets 21 a and 21 b of the liquid feeding device 21 by springs 314 and 315. Thereby, high-pressure air can be guided from the air chamber 11 into the liquid feeding device 21, or air can be discharged from the liquid feeding device 21. Similarly, air connection portions 322 and 323 are provided at the air inlets 22 a and 22 b of the liquid feeding device 22, and air connection portions 332 and 333 are provided at the air inlets 23 a and 23 b of the liquid feeding device 23. Air connection portions 342 and 343 are in close contact with the air outlets 24a and 24b, respectively.

  The high-pressure air generated by the compressor 10 is held in the air chamber 11 and adjusted to a substantially constant pressure by the regulator 12. The air adjusted to a constant pressure in the air chamber 11 is supplied to the sample liquid container 13 via the valve 1501, to the liquid feeding devices 21 to 24 via the valve 1502 and the supply connector 5, and to the system water container via the valve 1503. 14 to the liquid feeding devices 21 to 24 through the valve 1504 and the supply connector 5, respectively. Similarly, the air in the air chamber 11 is connected to the air connection portions 312, 313, 322, 323, 332, 333, 342, 343 via valves 1511, 1512, 1521, 1522, 1531, 1532, 1541, 1542. Are supplied respectively. The above-described valve is controlled by the controller 17 and is controlled to be opened so as to supply air from the air chamber 11 or to be closed so as to stop supply of air.

  The valves 1505, 1513, 1523, 1533, and 1543 are also controlled by the controller 17 so that the drainage container 7 and the air connection portions 313, 323, 333, and 343 are opened or closed with respect to the atmosphere. Control.

  Moreover, the pressure sensor 16 which measures the pressure in the air chamber 11 is provided, and the controller 17 controls each valve in order to adjust a pressure based on the signal supplied from the pressure sensor 16 as needed.

Further, physical properties such as absorbance of the sample solution flowing through the liquid feeding devices 21 to 24 are measured and analyzed by the light emitting units 911, 921, 931, 941 and the light receiving units 912, 922, 932, 942 of the photodetector.

(Details of liquid delivery device)
Details of the liquid feeding device 21 will be described with reference to FIG. In addition, since the liquid feeding devices 22, 23, and 24 have the same configuration as the liquid feeding device 21, overlapping description is omitted.

  FIG. 2A shows a side view of the liquid delivery device 21. As shown in FIG. 2A, the liquid feeding device 21 includes a flow portion 2101 in which a flow path is formed, and a top plate 2102 joined to the flow portion 2101. In FIG. 2A, the flow path formed inside the liquid feeding device 21 is indicated by a broken line.

  FIG. 2B is a top view of the liquid feeding device 21, that is, a plan view of the flow portion 2101 viewed from the direction of arrow A in FIG. 2A. Since this figure shows a state in which the top plate 2102 is removed, the flow path provided on the top plate 2102 side is indicated by a solid line, and the flow path provided inside is indicated by a broken line. As shown in the figure, the liquid feeding device 21 includes a first liquid pool portion 2109 that contains a sample liquid 131 sent from the sample liquid container 13 or a system water 141 sent from the system water container 14, and a second liquid pool unit 2109. A liquid pool portion 2113 is provided. Passive valves 2108 and 2110 are connected to both ends of the first liquid pool portion 2109, respectively. In addition, a first air port 2114 is provided between the connection portions of the first liquid pool portion 2109 and the passive valves 2108 and 2208. Furthermore, one end of the second liquid pool part 2113 is connected to a passive valve 2108 connected to the first pool part 2109, and a second air port 2115 is provided at the other end.

  FIG. 2C is a bottom view of the liquid-feeding device 21, that is, a plan view of the flow portion 2101 viewed from the direction of arrow B in FIG. 2B. As shown in the figure, a first air port 2114 and a second air port 2115 are provided, and the air in the air chamber 11 is supplied from the air connection portions 312 and 313 through the valves 1511 and 1512. One air port 2114 and the second air port 2115 are introduced. On the other hand, the air in the liquid feeding device 21 is discharged from the second air port 2115 to the atmosphere via the air connection portion 313 (not shown in the figure) and the valve 1513. The sample measurement unit 2106 includes the light emitting units 911 and 912 of the above-described photodetector, and measures and analyzes physical properties such as absorbance of the sample solution 131 that has been fed.

  Examples of the material of the fluidized portion 2101 and the top plate 2102 include resin, glass, silicon, silicone rubber, and metal. When resin is used for the fluidized portion 2101 and the top plate 2102, they can be processed by injection molding, hot embossing, cutting, and the like, and joined by heat welding. When glass is used for the flow part 2101 and the top plate 2102, they can be processed by injection molding and joined together by heat welding. Alternatively, the fluidized portion 2101 can be made of silicon by lithography and bonded to the top plate made of glass by anodic bonding. Alternatively, the fluidized portion 2101 can be made of silicone rubber such as polydimethylsiloxane, and can be joined to a top plate made of glass by surface activated joining by plasma irradiation. Moreover, when using a metal for the flow part 2101 and the top plate 2102, each can be processed by cutting and they can be joined by diffusion bonding or brazing.

  Further, the fluid part 2101 and the top plate 2102 may be bonded by sandwiching a thin adhesive sheet or adhesive between the fluid part 2101 and the top plate 2102. In this case, the flow part 2101 and the top plate 2102 can be made of any material.

  In addition, the fluidized part 2101 and the top plate 2102 may not be separately processed and joined, but may be produced as an integrated object by additive modeling such as an optical modeling method, a hot melt lamination method, a powder sintering method, and an ink jet method. it can.

  The liquid feeding devices 21 to 24 can be fluidly connected by the method described above with reference to FIG. 1 by forming each shape to be connectable. Therefore, the materials of the liquid feeding devices 21 to 24 may be different, and an optimum material can be selected according to the detection method.

Moreover, in FIG. 1, although the analyzer is comprised combining the some liquid feeding devices 21-24, you may produce the same flow path structure in one liquid feeding device. In this case, it is not possible to adopt a flexible device configuration such as changing the material of the flow path according to the detection method, but a packing member for connecting between the liquid feeding devices is not required, and the device configuration is reduced in size and simplified. Reduce the volume.

(Flowing motion)
3 to 14, in the chemical analyzer 1, the sample liquid 131 is allowed to flow only to the sample liquid measuring unit 2206 of the liquid feeding device 22, and the sample liquid 131 is measured and analyzed by the photodetectors 921 and 922. The flow operation of liquid and air will be described. 3 to 14 are diagrams in which FIG. 1 is simplified so as to describe only a portion through which the fluid flows in order to explain the flow of the fluid.

  FIG. 3 shows an initial state. A sample liquid 131 is placed in the sample liquid container 13, a system water 141 is placed in the system water container 14, and the other flow paths are filled with air. Moreover, all the valves 1501, 1502, 1503, 1504, 1505, 1511, 1512, 1513, 1521, 1522, 1523, 1531, 1532, 1533, 1541, 1542, and 1543 are closed. Here, a flow path for supplying the sample liquid 131 from the sample liquid container 13 that is a supply source of the sample liquid 131 to each of the liquid feeding devices 21 to 24 is a first flow path 213, and the sample measuring unit 2206 and the second The flow path connecting the liquid pool portion 2213 is the second flow path 216, and the flow path connecting the system water container 14 that is the supply source of the system water 141, the liquid feeding devices 21 to 24, and the drainage tank 7 is the first flow path. The third channel 212 is used.

  FIG. 4 shows a state in which the system water 141 flows into the third flow path 212. By opening the valves 1503 and 1505, the high-pressure air in the air chamber 11 is supplied to the system water container 14, and the system water 141 is pushed out. The extruded system water 141 flows into the drainage container 7 through the third channel 212. The air that was in the flow path before the inflow of the system water 141 is discharged to the atmosphere through the opened valve 1505.

  FIG. 5 shows a state in which the system water 141 is filled in each of the first liquid pool portions 2109, 2209, 2309, and 2409 of the liquid feeding devices 21 to 24. By opening the valves 1503, 1513, 1523, 1533, and 1543, the high-pressure air in the air chamber 11 is supplied to the system water container 14, and the system water 141 is pushed out. The extruded system water 141 flows into the first pool portions 2109, 2209, 2309, and 2409 through the first passive valves 2110, 2210, 2310, and 2410, respectively. Air that was in the flow path before the inflow of the system water 141 is discharged to the atmosphere through valves 1513, 1523, 1533, and 1543.

  The first passive valves 2110, 2210, 2310, and 2410 have extremely narrow channel widths compared to other channels and pipes. Therefore, when the liquid passes, the flow resistance of the first passive valves 2110, 2210, 2310, and 2410 is dominant with respect to other flow paths and pipes. Therefore, in the case of FIG. 5, the flow resistance of the third flow path 212 is negligible with respect to the flow resistance of the passive valves 2110, 2210, 2310, and 2410. As a result, the first liquid pool portions 2109, 2209, 2309, and 2409 are filled with the system water 141 at substantially the same flow rate.

  FIG. 6 shows that the high-pressure air in the air chamber 11 is supplied to the third flow path 212 by opening the valves 1504 and 1505 after the system water 141 is filled in the first liquid pool portions 2109, 2209, 2309, and 2409. In this state, the system water 141 is discharged to the drainage container 7.

  FIG. 7 shows a state in which the system water 141 filled in the first liquid pool portion 2209 of the liquid feeding device 22 is divided and discharged in two directions. By opening the valves 1505, 1521, and 1523, the high-pressure air in the air chamber 11 is supplied to the first pool portion 2209 through the first air flow path 2214. Half of the system water 141 pushed out by the supplied high-pressure air is discharged to the third flow path 212 through the first passive valve 2210. At the same time, the other half of the system water 141 is discharged through the second passive valve 2208 to the second liquid pool portion 2213. Air that was in the flow path before the system water 141 flows in is exhausted to the atmosphere through valves 1505 and 1523.

  The first passive valve 2210 and the second passive valve 2208 have the same shape, and therefore have the same flow resistance. Further, as described above, the flow resistance when the liquid flows is dominated by the passive valve. Therefore, in the case of FIG. 7, the flow rate of the system water 141 discharged through the first passive valve 2210 and the flow rate of the system water 141 flowing to the second liquid pool part 2213 side are substantially equal. The first air flow path 2214 is installed at the center of the first liquid pool portion 2209. Therefore, the time for discharging the system water 141 from the first passive valve 2210 and the time for discharging the system water 141 from the second passive valve 2208 are substantially equal.

  FIG. 8 shows that after the system water 141 is discharged from the first liquid pool section 2209 to the third flow path 212 and the second liquid pool section 2213, the system water in the third flow path 212 is drained. 7 is in a discharged state. As described above with reference to FIG. 6, the valves 1504 and 1505 are opened to supply the high-pressure air in the air chamber 11 to the third flow path 212, and the system water 141 is discharged to the drainage container 7.

  FIG. 9 shows a state in which the sample liquid 131 is filled in the sample measuring unit 2206 of the liquid feeding device 22. First, the valves 1501 and 1505 are opened, the high-pressure air in the air chamber 11 is supplied to the sample liquid container 13, and the sample liquid 131 is pushed out to the liquid feeding devices 21 to 24 side. When the sample liquid 131 is pushed out by a predetermined volume, the valve 1501 is closed and the valve 1502 is opened, whereby the sample liquid 131 pushed out from the sample liquid container 13 is introduced into the liquid feeding device 22.

  In this figure, the air that was present in the first flow path 213 before the introduction of the sample liquid 131 is pushed out by the sample liquid 131, passes through the first flow path 213, and is introduced into the liquid feeding device 22. Then, the liquid proceeds to the drainage container 7 and the valve 1505 through the second flow path 226 and the third flow path 212 and is discharged to the atmosphere. At this time, the inside of the liquid feeding device 22 is all air except for the second liquid pool portion 2213, but the liquid feeding devices 21, 23, and 24 are the system water 141 in the first liquid pool portions 2109, 2309, and 2409. Is filled with. Since the viscosity of air is much smaller than the viscosity of the liquid, even if high-pressure air is supplied from the air chamber 11, the air flows only to the liquid feeding device 22, and the air is fed to the liquid feeding devices 21, 23 and 24. Almost no supply. As a result, the sample liquid 131 is selectively supplied only to the sample measuring unit 2206 of the liquid feeding device 22.

  FIG. 10 shows a state in which the sample liquid 131 is filled in the sample measuring unit 2206 of the liquid feeding device 22. At this time, the valves 1501, 1502, 1503, 1504, 1505, 1511, 1512, 1513, 1521, 1522, 1523, 1531, 1532, 1533, 1541, 1542, and 1543 are all closed, and the sample liquid 131 is placed in the sample measuring unit 2206. The measurement is performed with the photodetectors 921 and 922 (refer to FIG. 1).

  FIG. 11 shows a state in which the sample liquid 131 in the sample measurement unit 2206 is discharged to the first liquid pool unit 2209. By opening the valves 1502 and 1505, the high-pressure air in the air chamber 11 is supplied to the first pool parts 2109, 2309, 2409 and the sample measuring part 2206 through the second flow path 213. System water 141 in the first pool portions 2109, 2309, and 2409 is discharged to the third flow path 212 through the first passive valves 2110, 2310, and 2410. In addition, the sample liquid in the sample measurement unit 2106 is discharged to the first pool unit 2209 through the second passive valve 2208. At this time, since the first passive valves 2110, 2310, 2410 and the second passive valve 2208 have the same shape and the same flow resistance, the flow rates flowing through them are substantially equal. The air that was in the flow path before the supply of high-pressure air passes through the valve 1505 and is discharged to the atmosphere.

  FIG. 12 shows a state in which all the sample liquid 141 in the sample measurement unit 2206 has been discharged to the first liquid pool unit 2209. In this state, since the valves 1502 and 1505 are opened following the state of FIG. 3I, the high-pressure air in the air chamber 11 is supplied to the first liquid pool portions 2109, 2209, 2309, and 2409. However, the flow resistance through which the sample liquid 131 flows through the first pool portion 2209 is much smaller than the flow resistance through which the system water 141 flows through the first passive valves 2110, 2310, and 2410. Therefore, the system water 141 in the first passive valves 2110, 2310, and 2410 hardly flows, and only the sample liquid 131 in the first liquid pool portion 2209 flows. At this time, the system water 141 pushed out from the first liquid pool sections 2309 and 2409 to the third flow path 212 in the state shown in FIG. 11 is drained by the air discharged from the first liquid pool section 2209. To be washed away.

  FIG. 13 shows a state in which the sample liquid 131 in the first liquid pool portion 2209 is discharged to the third flow path 212 through the first passive valve 2210. Since the valves 1502 and 1505 are opened following the state of FIG. 13, the high-pressure air in the air chamber 11 is supplied to the first liquid pool portions 2109, 2209, 2309, and 2409. Therefore, the system water 141 in the first liquid pool portions 2109, 2309, and 2409 is also discharged to the third flow path 212 through the first passive valves 2110, 2310, and 2410. At this time, since the flow resistances of the first passive valves 2110, 2210, 2310, and 2410 are dominant, the flow rates flowing through them are almost equal.

  FIG. 14 shows that after all the sample liquid 131 in the first liquid pool section 2209 is discharged to the third flow path 212, the system water 141 and the sample liquid 131 in the third flow path 212 are drained from the drain container 7. It is in a state where it has been discharged. As described with reference to FIG. 6, the valves 1504 and 1505 are opened, the high-pressure air in the air chamber 11 is supplied to the third flow path 212, and the system water 131 and the sample liquid 141 are discharged to the drainage container 7. .

As described above, the system water 141 filled in the first liquid pool section 2209 is divided by flowing air from the first air flow path 2215 installed at the center of the first liquid pool section 2209. Thus, only one of the sample measuring units 2106, 2206, 2306, and 2406 connected in parallel can be selectively filled with the sample liquid 131 and discharged. At this time, liquid does not come into contact with the valve that drives the valve body, and is used only for supply and discharge of air. In addition, since the replacement frequency is reduced, the running cost of the analyzer can be reduced.

DESCRIPTION OF SYMBOLS 1 ... Chemical analyzer 5 ... Supply connector 6 ... Discharge connector 7 ... Drain tank 10 ... Compressor 11 ... Air chamber 12 ... Regulator 13 ... Sample liquid container 14 ... System water container 16 ... Pressure sensor 17 ... Controllers 21, 22, 23, 24 ... Liquid feeding devices 21a, 21b, 22a, 22b, 23a, 23b, 24a, 24b ... Air inlet / outlet 131... Sample liquid 141... System water 181... Device holding fixture jig 182... Device holding movable jig 183... Guide rails 311, 321, 331, 341. 322, 323, 332, 333, 342, 343... Air connection 401, 402, 411, 412, 421, 422, 431 432, 441, 442 ... packing members 911, 921, 931, 941 ... light emitting parts 912, 922, 932, 942 ... light receiving parts 1501, 1502, 1503, 1504, 1505, 1511, 1512, 1513, 1521, 1522, 1523, 1531, 1532, 1533, 1541, 1542, 1543 ... valve 2101 ... flow part 2102 ... top plate 2106, 2206, 2306, 2406 ... sample measuring part 2109, 2209, 2309, 2409 ... first pool part 2213, 2213, 2313, 2413 ... second pool part 2114, 2214, 2314, 2414 ... first air port 2115, 2215, 2315, 2415, ...・ Second air port

Claims (7)

A first liquid feeding section for feeding a first liquid containing an analysis target; a second liquid feeding section for feeding a second liquid not containing an analysis target;
A liquid feeding unit comprising: a measuring unit that measures physical properties of the fed first liquid; a liquid pool unit that accommodates the fed first liquid and second liquid; and a plurality of passive valves. The device,
A drainage part for discharging the first liquid and the second liquid sent, and a chemical analyzer comprising:
The liquid pool part has a first liquid pool part and a second liquid pool part,
A first flow path connecting the first liquid feeding section and the liquid feeding device;
A second flow path connecting the measurement unit and the second liquid pool unit;
A third flow path connecting the second liquid feeding section and the drainage section;
A first air port provided in the first liquid pool section;
A second air port provided in the second liquid pool part,
The passive valve includes a first passive valve disposed between one end of the first liquid pool portion and the third flow path, the other end of the first liquid pool portion, and the first A chemical analyzer comprising: a second passive valve disposed between one end of the second liquid pool section. The chemical analysis apparatus according to claim 1, wherein the first flow path, the second flow path, and the third flow path are fluidly connected. apparatus. The chemical analyzer according to claim 1,
The flow resistance of the first passive valve is substantially the same as the flow resistance of the second passive valve.
. The chemical analyzer according to claim 1,
The first air port includes a connection portion between the one end portion of the first liquid pool portion and the first passive valve, the other end portion of the first liquid pool portion, and the second passive valve. A chemical analysis device, characterized in that it is provided between the connecting portion and the connecting portion. The chemical analyzer according to claim 1,
Having a plurality of the liquid feeding devices,
A chemical analyzer characterized in that each of the plurality of liquid feeding devices can be connected. The chemical analyzer according to claim 1,
The chemical analysis apparatus characterized in that the second liquid is system water. The chemical analyzer according to claim 1,
An air chamber for storing high-pressure air;
By supplying air from the air chamber, the first liquid feeding unit and the second liquid feeding unit are
A chemical analyzer that feeds the first liquid and the second liquid, respectively.